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子进程没有此类文件或目录错误。Python中的调用

tab-completion popen bash python

digitaLink · 技术社区 · 7 年前

Python脚本:

from subprocess import call
call(['read', '-ep', 'Path:', 'temporaryPath'])
print temporaryPath

错误回溯:

Traceback (most recent call last):
  File "tmp.py", line 2, in <module>
    call(['read', '-ep', 'Path:', 'temporaryPath'])
  File "/usr/lib64/python2.6/subprocess.py", line 478, in call
    p = Popen(*popenargs, **kwargs)
  File "/usr/lib64/python2.6/subprocess.py", line 642, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.6/subprocess.py", line 1238, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

1 回复 | 直到 7 年前

Julien Palard 7 年前

你想打电话 read 这是一个外壳内置:

$ type read
read is a shell builtin

这个特定的shell内置没有等效的程序:

$ which read
$

PATH 环境变量,根据 strace :

[pid 17266] execve("/usr/local/bin/read", ["read", "-ep", "Path:", "temporaryPath"], [/* 70 vars */]) = -1 ENOENT (No such file or directory)
[pid 17266] execve("/usr/bin/read", ["read", "-ep", "Path:", "temporaryPath"], [/* 70 vars */]) = -1 ENOENT (No such file or directory)
[pid 17266] execve("/bin/read", ["read", "-ep", "Path:", "temporaryPath"], [/* 70 vars */]) = -1 ENOENT (No such file or directory)
[pid 17266] execve("/usr/local/games/read", ["read", "-ep", "Path:", "temporaryPath"], [/* 70 vars */]) = -1 ENOENT (No such file or directory)
[pid 17266] execve("/usr/games/read", ["read", "-ep", "Path:", "temporaryPath"], [/* 70 vars */]) = -1 ENOENT (No such file or directory)
[â¦]
[pid 17266] write(4, "OSError:", 8 <unfinished ...>

阅读

$ python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
[GCC 6.3.0 20170118] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> subprocess.call('read', shell=True)
/bin/sh: 1: read: arg count
2
>>> subprocess.call('read foo', shell=True)
hello world
0

您现在遇到了一个新问题:shell内置 阅读 正在将读取的值存储为shell变量,该变量将在调用 subprocess.call .

哦,在 shell builtin你也没有完成。你应该用 input argparse

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